Theoretical predictions for magnetic interface anisotropy

Electronic structure calculations are used to predict the magnetic anisotropy of Co/Pd, Co/Pt, Co/Cu, Fe/Pt, and Fe/Ag superlattices. In the case of Co/Pd and Co/Pt, the magnetic anisotropy is analyzed as a deconvolution of volume and interface contributions. The experimental result of an orientation-independent interface anisotropy of 0.63±0.05 ergs/cm² for Co/Pd superlattices is also predicted by theory. The theoretical interface anisotropy is found to be 0.62±0.06 ergs/cm², in close agreement with the experiment. This result is not universally observed, and, based upon calculations for strained and unstrained superlattices, appears to be a consequence of the degree of strain found in the Co/Pd system. A symmetry derived model based upon summing L(M.R)² pair interactions accurately reproduces the observed anisotropy and the dependence upon atomic constituents, strain and growth direction